The conductivity of graphene samples with various levels of disorder is investigated for a set of specimens with mobility in the range of 1--20×10³ cm²/V sec. Comparing the experimental data with the theoretical transport calculations based on charged impurity scattering, we estimate that the impurity concentration in the samples varies from 2--15×10¹¹ cm^-2. In the low carrier density limit, the conductivity exhibits values in the range of 2--12e²/h, which can be related to the residual density induced by the inhomogeneous charge distribution in the samples. The shape of the conductivity curves indicates that high mobility samples contain some short-range disorder whereas low mobility samples are dominated by long-range scatterers.
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Tan et al. (2007) studied this question.
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